Capacitive screw, waveguide tuners are commonly used in microwave measurement systems and as devices for adjusting the impedance of various waveguide terminations. The design of a broadband tuner of this type has been a problem in the past. This paper des Topic: Wave guides.
The table of attenuation as a function of vane angle gives the attenuation in decibels produced by an angular displacement of the vane of a rotary-vane attenuator assuming ideal behavior of the attenuator.The attenuations for vane angles corresponding to Topic: Wave guides.
The table of attenuation error as a function of vane-angle error gives the error in decibels caused by vane misalinement which is common in the rotary vane attenuator.The attenuation errors corresponding to vane-angle errors ranging from zero to 0.499 deg Topics: Wave guides., Radio--Tables.
An approximate theory for conversion of modes in an earth-ionosphere waveguide is propounded.The model is two concentric spherical reflecting boundaries which have prescribed surface impedances.The localized irregularity at either the ground or the ionosp Topics: VLF radio wave propagation., Wave guides., Lower ionosphere.